A commenter named Norman Wei recently asked Cathy if Tom rehearsed repeatedly before getting in front of the camera for one of his videos. We were pretty sure we knew the answer, but checked with Tom. Here's what he said:
"There's less of an easy answer than you'd imagine. I do not rehearse in the formal sense. On the other hand, I come close to staying up all night before a speech going over my slides—over and over and over. Perhaps over 100 times???? Of course I formally modify the slides, to the point of de-emphasizing one word and emphasizing (italics) another. But as I go through the slides I am also sub-consciously, semi-consciously going through phrasing I might use. So in a way it's damn near rehearsal, though you're also right in that the main rehearsal is 3,000 or so speeches over about 31 years."